A221290 as a triangular array
| | | | | | | | | | 1 |
| | | | | | | | | | 1 | | 1 |
| | | | | | | | | 2 | | 4 | | 1 |
| | | | | | | | 4 | | 16 | | 12 | | 1 |
| | | | | | | 7 | | 52 | | 92 | | 37 | | 1 |
| | | | | | 12 | | 200 | | 673 | | 556 | | 114 | | 1 |
| | | | | 21 | | 792 | | 5912 | | 9107 | | 3332 | | 351 | | 1 |
| | | | 37 | | 3080 | | 48298 | | 172904 | | 123958 | | 19996 | | 1081 | | 1 |
| | | 65 | | 12164 | | 396846 | | 2890017 | | 4983598 | | 1686304 | | 119972 | | 3329 | | 1 |
| | 114 | | 47827 | | 3240527 | | 49684593 |
|
A221290 as a square array
| 1 | 1 | 2 | 4 | 7 | 12 | 21 | 37 | 65 | 114
| | 1 | 4 | 16 | 52 | 200 | 792 | 3080 | 12164 | 47827
| | 1 | 12 | 92 | 673 | 5912 | 48298 | 396846 | 3240527
| | 1 | 37 | 556 | 9107 | 172904 | 2890017 | 49684593
| | 1 | 114 | 3332 | 123958 | 4983598
| | 1 | 351 | 19996 | 1686304
| | 1 | 1081 | 119972
| | 1 | 3329
| | 1
|
A221290 as an upper right triangle
| 1 | 1 | 2 | 4 | 7 | 12 | 21 | 37 | 65 | 114
| | 1 | 4 | 16 | 52 | 200 | 792 | 3080 | 12164 | 47827
| | | 1 | 12 | 92 | 673 | 5912 | 48298 | 396846 | 3240527
| | | | 1 | 37 | 556 | 9107 | 172904 | 2890017 | 49684593
| | | | | 1 | 114 | 3332 | 123958 | 4983598
| | | | | | 1 | 351 | 19996 | 1686304
| | | | | | | 1 | 1081 | 119972
| | | | | | | | 1 | 3329
| | | | | | | | | 1
| | | | | | | | |
|
|
